提交事务 COMMIT TRANSACTiON Tran3 COMMIT TRANSACTION Tran COMMIT TRANSACTION Tran1 回滚事务 ROLLBACK TRANSACTION Tranl ROLLBACK TRANSACTION--提交事务 COMMIT TRANSACTION Tran3 COMMIT TRANSACTION Tran2 COMMIT TRANSACTION Tran1 --回滚事务 ROLLBACK TRANSACTION Tran1 ROLLBACK TRANSACTION